Maple uses I to mean the root of x^2 = -1. Try changing I to something different. Or, if you need to use I, insert this command immediately after restart: interface(imaginaryunit=Imag), or any name other than I. Please see ?interface. Hope this helps. J. Tarr

Arnold, The maximization problem can be handled by Maple 10, but it is not possible to solve your final equation for three variables from the one equation, not even with Maple! Please see the help page ?Optimization[Maximize]. Then try this restart; with(Optimization); Maximize(3.35*a+3.55*b+3.85*c-2.6*d, {a+b+c+d=1,d=0.016*a+0.016*b+0.04*c},assume=nonnegative); You should see that the solution also meets your minimization requirement, but try using the Minimization command to check it. Hope this helps. J. Tarr

If you try to use x' in worksheet mode, Maple will raise an exception. So you have to put it in backquotes like this `x'`. Alternatively, you can use document mode and choose the appropriate symbol from the diacritical marks palette and apply it to x, say. The x with its prime can then be copied and pasted into a worksheet. Hope this helps. J. Tarr

urkiyani, First make a little sketch on a piece of paper. If the total height of the lookout's eyes above the centre of the earth is h and the distance he can see is d then with R equal to the earth's radius, restart; d := sqrt(h^2 - R^2); Be careful with the units that you use, and you should get 63.24 km. It is down to you to think out the assumptions that are necessary for this simple model. Hope this helps. J. Tarr

J. Tarr

If you are new to Maple, please see the help pages that you can access by typing ?versions at the command prompt, and (later) ?updates,Maple10. You will also need to plough through the User Manual. Unfortunately, there is a lot of reading to do, but it is well worth it. Hope this helps a bit. J. Tarr

Your equation doesn't contain t, so unless something is missing, the derivatives of x and y with respect to t are both zero. J. Tarr

You may find what you want in the help pages - please see ?plot,device. Hope this helps. J. Tarr

Having opened a worksheet in document mode, enter everything shown in the example up to and including the arrow operator. Then enter a left brace { and click the piecewise entry in the expression palette. Alter the symbols in the piecewise entry appropriately, close with a right brace }, two right parentheses ) and a semi-colon. This should do what you want. Hope this helps, J. Tarr

Any engineering calculation involves units and the prefixes that you mention. Maple's "units" packages should be able to do everything that you want. Please search the help pages for units. Hope this helps, J. Tarr

If the new worksheet opens with a separate kernel the answer is yes. See Tools>Options>General. Hope this helps. J. Tarr

If you want to use CrossProduct or &x, you need to use with(LinearAlgebra) before doing so, or use the long version LinearAlgebra[CrossProduct](A,B) or LinearAlgebra[`&x`](A,B). Hope this helps, J. Tarr

If you want to substitute P for m*v in an expression, you could try this algsubs(m*v=P,expression); Please see ?algsubs for details. Hope this is what you want. J. Tarr

It is not too clear how your problem occurs. Could you please upload your worksheet? J. Tarr

Try searching the Application Center for string, wave, vibration, or Rayleigh. Good luck, J. Tarr